(As I mentioned, I am reviewing a couple of online tools to track the popularity of ideas over time. Please forgive this segway away from voting reform issues.)
Icerocket’s blog trends tool is a service to track the popularity of search terms over time based on how many blogs mentioned them recently. Their instructions are simple:
Enter item(s) to see mentions trended over time. Enter up to three queries under Trend Term(s). Type in the label you would like associated with each query under Display Label(s).